1 /*******************************************************************************
2 Copyright (C) 2013 Vayavya Labs Pvt Ltd
4 This implements all the API for managing HW timestamp & PTP.
6 This program is free software; you can redistribute it and/or modify it
7 under the terms and conditions of the GNU General Public License,
8 version 2, as published by the Free Software Foundation.
10 This program is distributed in the hope it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 You should have received a copy of the GNU General Public License along with
16 this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 The full GNU General Public License is included in this distribution in
20 the file called "COPYING".
22 Author: Rayagond Kokatanur <rayagond@vayavyalabs.com>
23 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
24 *******************************************************************************/
27 #include <linux/delay.h>
29 #include "stmmac_ptp.h"
31 static void stmmac_config_hw_tstamping(void __iomem *ioaddr, u32 data)
33 writel(data, ioaddr + PTP_TCR);
36 static u32 stmmac_config_sub_second_increment(void __iomem *ioaddr,
37 u32 ptp_clock, int gmac4)
39 u32 value = readl(ioaddr + PTP_TCR);
43 /* For GMAC3.x, 4.x versions, in "fine adjustement mode" set sub-second
44 * increment to twice the number of nanoseconds of a clock cycle.
45 * The calculation of the default_addend value by the caller will set it
46 * to mid-range = 2^31 when the remainder of this division is zero,
47 * which will make the accumulator overflow once every 2 ptp_clock
48 * cycles, adding twice the number of nanoseconds of a clock cycle :
49 * 2000000000ULL / ptp_clock.
51 if (value & PTP_TCR_TSCFUPDT)
52 data = (2000000000ULL / ptp_clock);
54 data = (1000000000ULL / ptp_clock);
56 /* 0.465ns accuracy */
57 if (!(value & PTP_TCR_TSCTRLSSR))
58 data = (data * 1000) / 465;
60 data &= PTP_SSIR_SSINC_MASK;
64 reg_value <<= GMAC4_PTP_SSIR_SSINC_SHIFT;
66 writel(reg_value, ioaddr + PTP_SSIR);
71 static int stmmac_init_systime(void __iomem *ioaddr, u32 sec, u32 nsec)
76 writel(sec, ioaddr + PTP_STSUR);
77 writel(nsec, ioaddr + PTP_STNSUR);
78 /* issue command to initialize the system time value */
79 value = readl(ioaddr + PTP_TCR);
80 value |= PTP_TCR_TSINIT;
81 writel(value, ioaddr + PTP_TCR);
83 /* wait for present system time initialize to complete */
86 if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSINIT))
96 static int stmmac_config_addend(void __iomem *ioaddr, u32 addend)
101 writel(addend, ioaddr + PTP_TAR);
102 /* issue command to update the addend value */
103 value = readl(ioaddr + PTP_TCR);
104 value |= PTP_TCR_TSADDREG;
105 writel(value, ioaddr + PTP_TCR);
107 /* wait for present addend update to complete */
110 if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSADDREG))
120 static int stmmac_adjust_systime(void __iomem *ioaddr, u32 sec, u32 nsec,
121 int add_sub, int gmac4)
127 /* If the new sec value needs to be subtracted with
128 * the system time, then MAC_STSUR reg should be
129 * programmed with (2^32 – <new_sec_value>)
134 value = readl(ioaddr + PTP_TCR);
135 if (value & PTP_TCR_TSCTRLSSR)
136 nsec = (PTP_DIGITAL_ROLLOVER_MODE - nsec);
138 nsec = (PTP_BINARY_ROLLOVER_MODE - nsec);
141 writel(sec, ioaddr + PTP_STSUR);
142 value = (add_sub << PTP_STNSUR_ADDSUB_SHIFT) | nsec;
143 writel(value, ioaddr + PTP_STNSUR);
145 /* issue command to initialize the system time value */
146 value = readl(ioaddr + PTP_TCR);
147 value |= PTP_TCR_TSUPDT;
148 writel(value, ioaddr + PTP_TCR);
150 /* wait for present system time adjust/update to complete */
153 if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSUPDT))
163 static u64 stmmac_get_systime(void __iomem *ioaddr)
167 /* Get the TSSS value */
168 ns = readl(ioaddr + PTP_STNSR);
169 /* Get the TSS and convert sec time value to nanosecond */
170 ns += readl(ioaddr + PTP_STSR) * 1000000000ULL;
175 const struct stmmac_hwtimestamp stmmac_ptp = {
176 .config_hw_tstamping = stmmac_config_hw_tstamping,
177 .init_systime = stmmac_init_systime,
178 .config_sub_second_increment = stmmac_config_sub_second_increment,
179 .config_addend = stmmac_config_addend,
180 .adjust_systime = stmmac_adjust_systime,
181 .get_systime = stmmac_get_systime,